Series B Fundraising: A Comprehensive Guide

How Does Series B Funding Work?

Series B fundraising is the second significant round of venture capital financing for a startup, typically after a successful Series A. At this stage, your company isn’t just proving an idea anymore. You’ve got traction, paying customers, and a business model that’s showing signs of serious scalability.

Investors in a Series B round are betting not on your potential anymore, but on your ability to scale and dominate your market. That means growth capital to expand the team, double down on marketing, build out the product, and maybe even explore new markets.

Startup Fundraising: Understanding the Various Rounds of Funding

As a startup grows and scales, it typically progresses through multiple rounds of fundraising. While the specifics can vary based on industry and geography, most startups follow a common path through the following key funding stages:

• Friends & Family Round: < $100k, provides initial capital to launch the business, can include angel investors, family, and friends.
• Pre-Seed Round: < $2.5M, used to develop a proof of concept, conduct market research, and build a team before seeking seed funding. Target investors are mostly Friends/Family, Micro VC's, Angels, Incubator/Accelerator. Investment is used to prove technology.
• Seed Round: <$5M, used to acquire customers, develop a minimum viable product, and validate the business model. Target investors are mostly Micro VC's, Angels, Institutional VC's. Investment is used to prove the market.
• Series A: <$25M, used to scale the business, expand operations, and hire additional staff. Target investors are mostly VC's, Super Angels, Family Offices. Investment is used to prove scale.
• Series B: Used to help the startup further grow its operations, develop new products, and hire additional staff. Target investors are mostly Institutional VC's & Family Offices. Investment is used to prove profitability.
• Series C and up: Funding provided to expand into new markets or make acquisitions, used to help the startup further grow its operations and increase its valuation. Target investors are mostly VC's, Crossover Funds, Growth Equity, Family Office. Investment is used to prove exit opportunities.
• Exit Event: An IPO or acquisition that provides liquidity to the startup's shareholders and can be the final round of funding.

While bootstrapping is always a viable path, founders should be aware that institutional funding typically comes with trade-offs, most notably, giving up a board seat in each round where a lead investor participates.

Understanding the different stages of funding, and knowing who to raise from at each stage, empowers founders to navigate the fundraising process strategically and secure the capital needed to grow and scale. This includes recognizing when pre-seed funding may be the right fit based on your company’s stage, goals, and resource needs.

How much Should You Raise for Series B?

The amount you should raise in a Series B round depends on your company’s stage of growth, strategic goals, and financial needs. Typically, Series B raises fall in the range of $10 million to $50 million, with many startups in 2024–2025 landing around $25 to $35 million. The right amount for your business, however, should be determined by a clear understanding of the milestones you want to achieve over the next 18 to 24 months. These could include hitting key revenue targets (such as $10 million in ARR), scaling your go-to-market teams, launching new products, expanding into new markets, or preparing for a future Series C round.

To calculate the amount you need, start by mapping out the capital required to reach these milestones, then work backward based on your current burn rate. For instance, if your monthly burn is $800,000, you’d need around $19 million to sustain operations for 24 months, rounding up to $20–25 million adds a buffer for unexpected costs or delays. At the Series B stage, investors are highly focused on efficiency metrics such as burn multiple, revenue growth rate, customer acquisition costs, and net dollar retention. Your fundraising should support improvement in these areas while allowing your company to scale responsibly.

While it may be tempting to raise as much as possible, over-raising can lead to unnecessary dilution and inflated expectations. It’s smarter to raise just enough to reach your next valuation inflection point with strong metrics and clear traction. Ultimately, think of your raise in terms of outcomes, not just time, secure enough capital to accomplish specific goals like tripling ARR, entering a new market, or hiring a high-performing sales team, rather than simply covering expenses for the next two years.

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Here’s a quick benchmark breakdown:

• Average Raise (US Startups): $33M–$40M
• Valuation Range: $100M–$300M pre-money
• Dilution: 15%–25% typically

How Do I Get Series B Funding?

Securing Series B funding requires a strategic and data-driven approach that builds on the traction gained in earlier rounds. By this stage, your company should show strong product-market fit, steady revenue growth (typically $1M–$5M+ ARR), and scalable operations. Investors will expect robust metrics like CAC, LTV, burn multiple, and net dollar retention, especially for SaaS companies, where an NDR above 120% is ideal.

Start by identifying venture capital firms that actively invest at the Series B stage in your industry. Prioritize warm introductions through existing investors, advisors, or fellow founders, as relationships are key. Your pitch should clearly outline how your business has grown, what you’ve learned, and how this capital will help you scale.

Run a focused fundraising process by scheduling meetings in a tight window to build urgency. Once you secure a lead investor (often contributing 30–50% of the round), you can fill out the rest. Be thoughtful in negotiating terms, especially valuation and governance, as they shape your company’s long-term trajectory.

How Much Equity Should I Give up Series B

In a Series B round, founders typically give up 15% to 25% of the company’s equity. The exact amount depends on how much you’re raising, your valuation, and the level of investor interest.

For example, if you’re raising $25 million at a $100 million pre-money valuation, your post-money valuation would be $125 million, and you’d be giving up 20% equity ($25M ÷ $125M). This range is considered healthy, it gives investors enough ownership to be incentivized without overly diluting the founding team.

To stay on track for future rounds, most companies try to keep cumulative founder dilution (from Seed to Series B) under 50%. This ensures the team still has significant ownership going into Series C and beyond. Keep in mind that giving up more equity might be worth it if you’re partnering with top-tier investors who can materially accelerate your growth. The key is to balance dilution with the capital and support needed to hit your next major milestones.

What is the Average Series B Size?

The average Series B round size typically ranges between $20 million and $40 million, though it can vary widely depending on the industry, geography, and company growth stage. In recent years, especially in tech hubs like Silicon Valley, the median Series B has hovered around $25 million to $35 million. Companies raising Series B are usually more established with proven traction, so the rounds tend to be larger than Seed or Series A, providing enough runway to scale sales, marketing, product development, and expand into new markets.

Valuation data from AngelList Venture shows us the Post Money Valuation of most Series B Rounds:

What Do Series B Investors Want to See?

When considering a potential investment opportunity, Series B investors are typically looking for the following:

• Consistent Revenue Growth
  Investors expect your company to be growing quickly and steadily—often aiming for 2x or more year-over-year growth. This shows that your business is scaling successfully.
• Strong Unit Economics
  Metrics like a healthy LTV:CAC ratio (customer lifetime value to customer acquisition cost) and low customer churn indicate that you’re acquiring customers efficiently and retaining them well.
• Product-Market Fit
  Clear evidence that your product meets real market needs and that customers find ongoing value in it. This reduces early-stage risk for investors.
• High Net Dollar Retention (NDR)
  For SaaS companies, an NDR above 120% means existing customers are expanding their usage or spending, which signals strong growth potential.
• Efficient Capital Use
  A favorable burn multiple (how much capital you burn relative to net new revenue) demonstrates that you’re using investor funds wisely to grow revenue.
• Scalable Operations
  A growing and effective team, especially in sales, marketing, and product development, shows you can expand without losing efficiency.
• Clear Go-To-Market Strategy
  Investors want to understand how you plan to reach new customers, enter new markets, or launch new products to accelerate growth.
• Defined Use of Funds
  A transparent plan for how the Series B capital will be spent to hit key milestones and increase company value.
• Path to Profitability or Next Raise
  Confidence that you either have a route to becoming profitable or a clear plan to raise further rounds with even better terms.
• Market Leadership Potential
  Evidence that your company can dominate its market or carve out a significant competitive advantage to deliver strong returns.

By demonstrating strength across these areas, you’ll build investor confidence that your company is ready for the next phase of growth and positioned to deliver significant returns.

Conclusion

Series B fundraising is a critical milestone for startups transitioning from early traction to scalable growth. It requires a clear demonstration of product-market fit, strong financial metrics, and a compelling growth strategy that convinces investors your business is ready to expand efficiently. By understanding the right amount to raise, how much equity to offer, what investors expect, and how to navigate the process, founders can position themselves for a successful round that fuels the next chapter of their company’s journey. With careful preparation and a focused approach, Series B funding can unlock the resources and partnerships needed to accelerate growth and achieve long-term success.